George Agar-Ellis, 1st Baron Dover [1797-1833];[1] by descent to his granddaughter, the Hon. Lilah Agar-Ellis, later Lady Annaly [1862-1944], until c. 1922. (M. Knoedler & Co., London and New York); sold January 1922 to Andrew W. Mellon, Pittsburgh and Washington, D.C.; gift to his daughter, Ailsa Mellon Bruce [1901-1969], New York, by 1937; bequest 1970 to NGA. [1] George Agar-Ellis was married to Lady Georgiana Howard, granddaughter of the sitter. His mother was Lady Caroline Spencer [d. 1813], eldest daughter of George, 4th Duke of Marlborough and cousin of the sitter. It is possible that Lady Caroline may have inherited the painting from Georgiana or her husband, William, 5th Duke of Devonshire [1748-1811], and bequeathed it to her son. George's son was Henry Agar-Ellis, whose daughter, the Hon. Lilah Agar-Ellis, later Lady Annaly, inherited the painting.